Flexible packing for centrifugal pumps



sept. 29, 1925.

Filed Feb. 20, 1923 lziizesses [avez/Libr im v fb' an MP/o/EQf'ic, )M @M ma ma?,

Patented-sept. 29, 1925.-

YUNITED sTAjrEs PATENT oFF.1CE.

IVAN P BOKOFIEFF, F NEW YORK, 'N. Y., A'SSIGNOR T0 WALTER. E. GAEAGN, 0F BROOKLYN, NEW YORK. I I

FLEXIBLE PACKING non cnnrmrucu. ruins.

Application led February 20,1923. Serial No. 6205260.`

To all 'whom 'uit concer/t.'y Be it known that I, IVAN M. Pnonorrnrrg, a citizen of they United States, residing in New York, in the county of New York and State of New York, have invented ce'rtair'x new and useful Improvements in Flexible Packings for Centrifugal Pumps, o f which the following is a speciiication.

This 'invention relates to centrifu al pumps and water sealing devices there or though-it is noted that the invention is not limited to'p ps nor even in some respects to water seals.

One object of the invention is to provide in an apparatus of thiskind an improved water` seal which is sealed by thepressure 'of the water in the pump.

Another object of the invention is to prevent water circuits between the' impeller and inboard'head and suction spool of the pump to preventv lowering ofthe efficiency of pump and quick wearing of the impeller and liners.

Another object is to prevent leakage of water through thestufnng box of the pump, which leakagegis extremely harmful when handling dirty water asl in dredging.

Another object' of the invention is the Ypreservation of the impeller from Vquick ,wearing out, a wearingsleeve being providedthat. is adapted to be replaced as soon -as said sleeve is worn.

` Another object is to. provide such a wearing sleeve of`suitable elastic material, and of a shape to eliminate the necessity of accurate fittings. l

Another object of the invention is to provide in'an apparatus of this kind an improved arrangement of bearings for the im- 4.0 peller and linings for the casing.v

Other objects of the invention are to improve generally the simplicity and eiciencyof such pumps or devices and to provide a device' or apparatus of this kind which is durable, veconomical to manufacture and operate and which will-not get out 'of order. The inventive features for the accom-- `plishment of these andother objects are shown in connection with an 1 improved cen- I' 60 'trifugal ypump which, vbrieiiyVV stated, comprises a casing ring carrying an` annular outboard headsecured `to o'11 e fedge ofthe rin andan annurlariinboard head secure-dfy d to t e other edg'f the casing. `:A lstulin box secured axlally on the outboardhea carries a bearing-.sleeve therein ;'whi1e; a'sucl.

-tion `spool iss'ecured axially on the inboard l y head. Anilnpeller between the headsl has abearing hubl in said sleeve, andl impeller ondui'ts'are joined at the center to forman" -intake conduit in an intake hub registering withY the s ool. Arubber sealing ringcured to t 4e inner edge of. the -outboard,

head 'presses on said sleeve to make a water tight seal; and a rubber bushing or sealin ring is interposed between the intake and the inboard head.

Other objects ofthe invention will appear as the description proceeds; and while herein details of the invention Kare described,

the inventionv is not limited to these,-since many and various chan es may be made lwithout departing from t vention as claimed. 4

In thel accompanying drawing, showing e scopeof the inv by way of exam le,one of many possible embodiments of t e invention,

Fig. 1 is a side elevationof the pum Fig. 2 is a substantially-verticalaxia sectional view, partly in elevation, of the pump, and v Fig. 3 is a transversesectional view ofthe bushing or sealing ring. v

My vinvention 1s shown in combination -with a pump1 comprising a casing having thereon a casln ring 5 formed 'with a lower tangential disc arge conduit 6 and feet 7, -for resting on`su1table'sup Orts, 8. Said ring supports an annular lout ard'head 10 formed on its inner face with an annular outwardly disposed shoulder `11, and an annular peripheralV recess 12 receiving one edge of the ring, the head being secured in An annular inboard head 20 is formed on its 4inner face 4with an intermediate out-l wardly disposed shoulderl 21` of the same j i diameter as said annular shoulder, and an annular peri heral recessr 22 receiving the other edge o the ring, the head being held in place by bolts 23, the outer face of the inboard head is formed at the inner edge with a boss-seat 25 provided with an annui inboard/ head and terminates at said shoulder 21 and near the inner edge of the inboardhead.

A stuiling box comprising upper and lower halves is provided with an inner inturned end flange 34, and an intermediate flange 31 bolted on the annular seat 15. This stuing box 30 receives a wearing sleeve 33 which is engaged on the outer side by the end flange 34 and on the other bythe bronze glands 35 in the inner portion. A neck bushing comprising blocks 36 in said stuin box 30 is engaged by the packing 3 secured to the box and pressingl the nec bushing into position.

A suction spool piece 40 is provided with a lateral inner end flange 41 secured by bolts 42 on said boss seat 25 and has an inner groove 43 therearound receivin a spool liner or bearing means 44 against which is dis osed a wearing ring 45 engaging said sea ing ring 27. An impeller 48 disposed between said 1inings 18 and 28 perip erally flush therewith is provided with an intake hub 49 .on which is received said ring 45. The impeller is also provided with a bearing hub 50 journalled in said wearing sleeve 33, and impeller conduits 52 disposed outwardly from center to the peri hery of the impeller and ]omed at the inta e end to form an intake conduit 53 registering with said spool 40.

The purpose of the sealing ring 27 is to prevent a water circuit between the impeller andthe inboard head 20 and suction spool 40. This circulation is harmful for eiiciency'of pump and causes rapidwearingof the impeller and liners.

A nut-receiving recess 55 joins a tapered bore 56 of the bearing hub receiving the tapered end of a drive shaft 57 provided with al threaded reduced end 58 receiving a cone shaped nut 60 filling said nut-receiving recess and pointing toward the intake end of the intake conduit.

A channel shaped rubber sealing ring 62 having its bottoni portion engaging around the inner end of said sleeve has its outer wall 63 engaging around said end flan e 34 of the stuffing box and its inner wal 64 en aging the side oftlie impeller.

he purpose of the sealing ring 62 is vto prevent the leakage of water through the harmful in case of handling dirty water like in dredging, because any 4dirt that might pass into-the stuffing box will pro. duce a very quick wearing out of the impeller hub. f l

For the purpose of preserving the impeller from quickly wearing out, the wearing sleeve is readily removable and interchangeable so that as soon as the wearing sleeve becomes worn a new one maybe put in its place, thus preventing any harm to impeller. l'

The wearin sleeve 33, which is a principal feature o this invention, is constructed of any suitable elastic material, and is ofso l a sha e that eliminates all necessity of preoise ttings in parts which in other constructions of pump are to revent local water circulation and the leakage through the stuing box.

Both sealing rings 27 and 62 are channellike in shape with the side flanges or walls 73 and 74 tending to s read apart, as shown in the solid lines of 3 when said ring is not in place; but place said flanges are forced together but tend to spring outward and thus insure safe contact with the rotary parts; and sealing of water is thereby secured. A

Annular casing liners 67 having their outer edges adjacent to the edges of the casing ring 5 have their inner edge portions disposed over the outer edges of said hners ig; I w en the ring is-in 18 and 28 and the edges of the limpeller but clearing the impeller conduits 52. The operation ofthe ump is siinle, and is obvious from the oregoing. e iineller iis rotated in the ordinary way to raw the water or other iluid in -atthe spool 40 and force it out at the conduit ,6.-

The water which leaks between the iinpeller and the liner 18 passes into the chamber 70 formed b the seat 15 and lian e 31 and thence into t e channel of the sea ing ring 62 and presses the walls 63 and 64 against the flange 34 land the side of the impeller respectively makingm Joint which is practically water tight and. at the same time allows for some flexibility of movement of the parts.

In like manner, water tight on the hub 49; and .water which leaks between the im eller and the 1min 28 passes into the `c amber 71v Fig. 2 formed between the ring 45 and t e inner edge of the inboard head, and thence into the channel 72 (Fig. 3) of the sealing ring 27 and exerts pressurefu n the walls 73 and 74 thereby to force t em more tightly against the seat 26 andthe ring 45 respectivelv, making a joint which is practically water tight and at the same time allows for the'wearing ring 45 is some flexibility of movement of the parts.

Lisepaal by removing the necessary bolts, including the bolts'13, 23, 75 and 76:

, I claim:

1. In a centrifugal pump, the combination with a casing having an opening, ofv 'an impeller in said casing, said impeller-havingA .channel shaped sealing vring `ha'vlng one flange thereof disposed on said wearing ring,

and thev other iange being disposed against i the casing in said opening whereby to form a {luid-tight seal. v Y

2. In combination, .a casing having van opening; an impeller in the 'casing having a hub inthe opening; a wearing sleeve, a `bearihg means mounted on the casing and receiving the hub; a flange surrounding said wearing sleeve, and ,a channel shaped flexible seal mounted on the casing adjacent the vimpeller and pressed on said means b fluid pressure .in the casing, the sides of sald` seal ybeing adjacent the impeller blade and flange whereb'ypto prevent leakage.'l

3., In combination, a casing having axial openings on` opposite sides; a stulng box over one opening having a bearing'sleeve therein; an impeller in the casing having its impeller conduits communicating' with the other' opening; and achannel shaped sealvingring around `said sleeve having one wall resting against the endfof said stuilingbox and the other Wall resting against the im'- peller and adapted to receive Huid pressure `from fluid pressing between the caslng and impeller,

4.' In combination, a casing having axial openings; an impeller in the casing havin' an intake registered with one opening an a hub in the other; a bearing means mounted on the casing and having a sleeve'receiving the hub; and a channel shaped` fiange ring mounted on the casing and between the impellerV and the sleeve member for forming a water seal upon application of l fluid pressure thereon.

5. In combinatioma casing having axial openings on opposite sides; a stuiiing box forming an annular chamber over one opening and having its inner end .in Said chamber; a bearing sleeve in said stufling'box;

an impeller in the casing having its impeller conduits communicating with the other opening; a shaftin said sleeve; and a chan nel shaped rubber sealing-ring 1n saidchaxn... ber having its bottom around said sleeve and its walls resting against said end and the impeller respectively and adapted to receive fluid pressure from Huid pressing between the casing and impeller.

6. In combination, a casing ring; an an,

v nular outboard head secured to one edge of the ring; an annular inboard head secured to the other edge of the ring; a stuffing box secured axially of the outboardnhead; va

ange on said stuiling box.; a suction spool secured'axially on the inboard head; a bearing sleeve in said stuiiing box; an impeller between the heads and having a bearing hub in said sleeve, and impeller conduits `joined e at the center to vform `an intake condult reg- 4' istered with the spool; and a channel shaped l flexible ring disposed -between said impeller 'i usl with a lower Vtangential disc ,arge conduit zand, `feet forv resting onl suitable supports; aan lannular `'outboard head secured tov one -1 edgo'of the ring; anannular inboard head securedto the other edge of the casing ring; said headshavingaxialopenings an impeller in the casing having an intake reg'- istered with one-opening and a hub in the other; a bearing means mounted'on the cas-l ing and having a sleeve receiving the hub and a channel-shaped Iiexible ring between.' said impeller and sleeve to yform 'a zwater seal therebetween. u l

8. In combination, a casin ring; an annular outboard head vforme on its inner face with an annular outwardly disposed near theinner edge of the inboard head; an

impeller between said. linings peripherally flush with said shoulders and. provided with 1- impellerfconduits joined at vthe center. to form an intake conduit co-axial with the inboard head; and annular casing liners each having its outer edge adjacent to the.edges of the casing ring andthe peripheral edges of the heads,y andv having gits inner edge p0rtion disposed overthe` outer edgeso said linersandthe impeller. butvclarmg the im; P81181 conduits. y v l A f combinatiom'a'casingring; an annulafinboard'head Securedto Atheone edge i ofA the. casing; an annular outboard `head formed on its'in'ner lfaceiwith an annular peripheral receiving the other edge 0f, the rin ;.the `outer face of the headbeing forme near the inner edge. wlth a raised 'annular 4seat 'roviding an annular groove next to said edge an intermediate .flange secured on said annular seat.; abearing sleeve `therein; a suc- `tion spool secured axially on the inboard head 5 anl impeller' be/tween the heads and a stuing box comprising havin a bearing hub in said sleeve, and impeller conduits joined at the center to form an intake conduit registered with `the spool and a channel shaped flexible ring pressing on said impeller and the inner end of the stuffing box` to form a water seal.

10. In combination, a casing having axial openings on opposite sides one of which is surrounded by an annular seat forming an annular'chamber; a stuiling box mounted over one opening and comprising upper and lower halves provided with an inturned end ange and with an intermediate flange secured on said annular seat; a wearing sleeve in said stuiing box; bronze glands in the inner end of the box and engaging said inturned flange and the sleeve; a neck bushing comprising blocks in said box; a packing ring secured to the box and pressing the neck bushing in place; an impeller in the casing having a hub in said sleeve and its impeller conduits communicating with the other opening; and a sealing ring in said chamber and having its edge outwardly turned and resting on said flange and impeller respectively adapted to receive fluid pressure from fluid pressing between the kcasing and impeller.

11. VIn combination a casing ring, a casing comprising an annular outboard head secured to one edge of the ring, and an annular inboard head secured to the other edge of the casing ring; the outer face of the outboard head being formed near the inner edge with a raised annular seat; a suction spool secured axially on the inboard head; a stuing'box provided with an intermediate flange secured on said annular seat 'and' forming an annular chamber around said groove; a wearing sleeve in said stuffing box having its inner end in Saidhamber; an impeller between the heads and having a bearing hub in said sleeve, and impeller conduits joined at the center to form an intake conduit registered with the spool; a rubber sealing ring in said chamber having its bottom disposed around said sleeve and its edges out-turned and engagformed at the inner edge with a boss-seat provided with an annulargroove inits inythe outer face of the inboard head being ner face; a channel shaped sealing ring having inwardly pointing l side walls one of which is disposed in said annular groove; an impeller between said heads and having an intake hub, and impeller conduits joined at the center to form an intake conduit; a suction spool piece provided with, a lateral inner-end flange securedonsaid boss-seat and having an. inner groove therearound; a

spool liner in said inner groove; and a wearing ring disposed on said hub against said liner and engaging `the inner 'Wall of said sealing ring.

13. In combination, a casing comprisingv an annular outboard head and an annular inboard head having a ring axial therefor; a stuing box secured axially. on the out-board head; a wearing sleeve in said box; an impeller between the heads and having a bearing hub in said ring, a taper-bored bearing hub in said sleeve, and impeller conduits disposed outwardly from center to periphery of the impeller and joined at the intake end to form an intake conduit registered with said ring; said conduit being provided centrally with a nut-receiving recess joining the tapered bore of the bearing hub; a drive shaft having a taperedl end engaged in said bore and provided wlth a threaded reduced end; a cone shaped nut on said end filling said nut-receiving recess and pointing toward the intake end of .the intake` conduit and a cup ,shaped f iexlble ring disposed between the impeller and the stuing box to form a water seal'therebetween.

.IVAN M; PnoKoFIEFF. 

